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The Buck converter Battery Eliminator, is designed to replace the now long unobtainable HT battery AND
the LT batteries that were used in many pre-war valve "portable" sets of the 1920's and 30s
The Eliminator provides an HT supply and a regulated, adjustable, LT supply for the filaments.
The HT voltage is unregulated (but smoothed) the actual voltage is not very critical as
battery sets were designed to cope with a reducing HT voltage over the life of the battery,
I can provide HT voltages of 120,90,68,45 just message me or leave a note at checkout.
The Buck converter version may introduce some switching noise but should not be
a problem especially with the low sensitivity 2 or 3 valve TRF sets of the 1920 that most people use these with,
I can also provide a fixed linear regulator version with lower LT curent capacity of
200mA bit that will be radio silent !
The LT side is variable and can supply a maximum current according to the 2.5VA rating of the transformer.
i.e. upto about 1.25 Amps at 2 volts or less reducing to half an Amp at 4 volts and 250mA at 8 Volts.
That is fine most radios that use a dry battery for the valve heaters, and SOME sets with a rechargeable
lead/acid battery that will usually take a higher heater current.
Pye/Vidor/EverReady etc. sets with a valve line-up of typically DK96,DF96,DAF96,DL96 will work fine with 90V
HT 1.4V LT, but for those I would recommend my linear version. I can check your set for
suitability before ordering I have most schematics in my collection and am happy to send to you.
The 230V mains input, HT and LT connection are all made using screw terminals,
so no soldering is required. The Eliminator provides full isolation from the mains input,
and will allow the set to pass PAT tests. The mains input Live/Neutral can be connected
either way round, it does not matter. Be aware that mains voltage is present at a few points
on the PCB underside, so care should be taken when mounting, using stand off bushes on the
mounting screws or making other provision for the board's underside to be insulated from
the set's case or chassis (not usually a problem with a wooden case!).
There is no mains voltage accessible from the component side apart from the connector screw terminals.
The PCB dimensions are 92mm x 64mm x 37mm high, by comparison, a B126 battery is 2.5 x 4 x 2"
(102 x 64 x 51 mm). The LT and HT supplies are electrically isolated from each other.
I usually wire these up with an inline switch (table lamp switch) in the mains cable (not supplied)
so no alteration is required to the set for a mains on/off switch, suitable made up cables can be
rescued from table lamps as found in charity shops etc. for around £2.
Only 230VAC models are currently available!